(1981). Teaching statistics and probability: 1981 yearbook. National Council of Teachers of Mathematics.
Chicago-Zitierstil (17. Ausg.)Teaching Statistics and Probability: 1981 Yearbook. Reston, Va: National Council of Teachers of Mathematics, 1981.
MLA-Zitierstil (9. Ausg.)Teaching Statistics and Probability: 1981 Yearbook. National Council of Teachers of Mathematics, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.